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EEPROM-Slide7

A pull-up resistor is recommended on the WP pin. This pin can be used to prevent writes to all or a portion of the array. Having the WP pin at logic 1 enables write protect and prohibits writes. At logic 0, writes are permitted. The WP pin is often connected to ground and always allows writes to the array but this implementation can be risky because EEPROMs typically write at low voltages, often below 1.8V. Many MCUs operate erratically at these low voltages and can send random codes to the EEPROM that could be interpreted as actual commands. This will likely happen during high power up and power down operations and can corrupt data.

PTM Published on: 2011-11-07